Add DebugBear for production performance testing

[mattzeunert]

Hi there,

I wanted to suggest adding a free tool we've been building to the list of performance testing tools. You can see an example test result here.

One feature that I think is especially useful is the ability to analyze JSON state that's embedded in the HTML. We've been making some changes recently to better pick that up for Vue apps, for example identifying different VitePress global state variables.

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